1. If you are using the stock tire size on the Sumitomo HTR III, my recommendation below of 12mm should work. For reference, I used a larger 265/40/18 for my stock rear wheels and I had to go down to 10mm.
2. 12mm spacers all around is pretty safe.
3. Yes, it's as simple as you described
4. I bought my spacers from ecstuning.com
Hope that helps....
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